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<pre class="textdiagram" id="fig59">
+------------+               +------------+
|            |               |            |
|  Primary   |<------------->|   Backup   |
|  "slave"   |               |  "master"  |
|            |               |            |
+------------+               +------------+
                                    ^
                                    |
      +-----------------------------+
      |
+-----+------+
|            |
|   Client   |
|            |
+------------+
</pre>
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